In performing progressive muscle relaxation, the athlete must first tense the muscles for _____ seconds, and then relax them for _____ seconds.

In performing progressive muscle relaxation, the athlete must first tense the muscles for _____ seconds, and then relax them for _____ seconds. 




A. 5-7; 10-15
B. 5-7; 20-30
C. 10-15; 10-15
D. 10-15; 20-30


Answer: 




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